/**
 * BibSonomy-Web-Common - Common things for web
 *
 * Copyright (C) 2006 - 2016 Knowledge & Data Engineering Group,
 *                               University of Kassel, Germany
 *                               http://www.kde.cs.uni-kassel.de/
 *                           Data Mining and Information Retrieval Group,
 *                               University of Würzburg, Germany
 *                               http://www.is.informatik.uni-wuerzburg.de/en/dmir/
 *                           L3S Research Center,
 *                               Leibniz University Hannover, Germany
 *                               http://www.l3s.de/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.bibsonomy.web.spring.converter;

import static org.bibsonomy.util.ValidationUtils.present;

import org.springframework.core.convert.converter.Converter;

/**
 * @author dzo
 * @param <T> 
 */
public class StringToEnumConverter<T extends Enum<T>> implements Converter<String, T> {

	private final Class<T> enumType;

	/**
	 * 
	 * @param enumType
	 */
	public StringToEnumConverter(final Class<T> enumType) {
		this.enumType = enumType;
	}
	
	@Override
	public T convert(String source) {
		if (!present(source)) {
			// reset value
			return null;
		}
		
		/*
		 * to upper case (= case-insensitive)
		 */
		source = source.toUpperCase().trim();
		return Enum.valueOf(this.enumType, source);
	}
}